Did you just copy or maybe paraphrase this all from a book? It reads like you just finished a book and now figure you know all about rifle accuracy.
My take is that you have an inch worth of knowledge or understanding of the topic that you are spreading a mile long.
No, each shot has three phases. The interior ballistics, of what happens to the bullet in the bore, the let off or uncorking as the bullet exists the crown and free flight. All three of those are important along with the transitions from each phase to the next.
No necessarily. When the bullet exists the crown, a number of important things occur, that can affect the trajectory. And then let's not overlook the hundreds of yards of atmosphere the bullet must cross before reaching the target. That atmosphere is not homogenous nor constant.
That is complete baloney. First off headspace has little to do with accuracy. Second, what makes you think that headspacing off the rim is any more consistent than headspacing off the case mouth? Both are subject to variations in case length.
I suspect you are conflating headspace with the loaded length of the bullet and its relation to the lands ... which is not the headspace. Maybe look up what headspace actually is?
For someone who has posted a very long winded explanation of accuracy, you have NO CLUE what headspace is or what it means or how it may or may not affect accuracy.
The SAAMI headspace range for any cartridge is 0.004". If you have a rifle with ca. .044" of headspace, the thing would pull the case heads off with every shot.
You are clearly describing the loaded length of the cartridge and the distance from the bullet ogive to the lands. That IS NOT the headspace. Headspace is the relationship between the chamber and the case, and it does not involve the bullet at all.
Yes, reducing the bullet jump to the lands does in fact increase accuracy because it ensures the bullet engraves into the lands straight to the bore. The longer the jump distance, the more chance there is for the bullet to enter the lands slightly cockeyed, which then degrades accuracy.
Nobody is suggesting that changing the distance to the lands by a couple of thou will make any difference but bringing the bullet 40 thou closer certainly will.
YES there friggen is. The rim thickness greatly affects the firing pin hit and thus the ignition process of the primer and subsequently the powder. The reason we have Match or Benchrest grade primers is to ensure consistent primer and powder ignition. Sorting rimfire rounds by rim thickness is essentially the same thing as using Match grade primers.
Who are you to make these statements? What expertise do you have in the topic or industry? You are telling us all how it is, without telling us your credentials to make such statements.
